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Installation and Operation
2.3.2
The Embedded System Firmware
The Mixed Signal PICtail? Demo Board firmware utilizes PICmicro ? microcontroller
assembly language, Microchip MPASM? assembler and MPLINK? linker to build
the.HEX machine file. MixedSignal_v100.asm , DAC_dtmf.asm , p16F767.inc
and MCP492X_16f767i.lkr files are needed in your project to build the
MixedSignalPICtail.hex .
MixedSignal_v100.asm contains the main program and most of the subroutines.
After initialization of critical PICmicro microcontroller peripherals (including the internal
oscillator to 8 Mhz), the main loop polls the four DIP switches to determine the selected
mode of operation. The DIP switches create a 4-bit binary number from 0 to 15. If a
change of mode is detected for 100 ms during 500 ms of scanning, a new mode is
selected and the LEDs are alternately flashed for two seconds. Most of the modes will
time-out and re-scan the DIP switches periodically.
Refer to Appendix C. “MixedSignal_V100.asm Description” for the commented
source code further describing each mode.
Modes 0XXX primarily utilize the MCP492X DAC modes:
1. Mode0000: Use the DTMF generation subroutine (located in DAC_dtmf.asm )
to dial a phone number stored in memory. Analyze output on V OUTB or V OUTD ’s
SMA connector. See Appendix F. “DTMF Scope Captures” for resulting
waveform frequency analysis.
2. Mode0001: Send 000h and FFFh commands to generate a 100 Hz R-R output
on the MCP492X. Probe V OUTA and V OUTB to see the resulting waveforms.
3. Mode0010: Send 400h and BFFh commands to generate a 100 Hz output on the
MCP492X. Probe V OUTA and V OUTB to see the resulting waveforms.
4. Mode0011: DACA = SHDN, DACB = SHDN, PIC = SLEEP. This mode demon-
strates the low-power nature of the DAC, the PICmicro microcontroller, the op
amp and the LDO. A power cycle is required after the mode switch is changed to
exit this mode.
5. Mode0100: DACB and DACA = 800h and Read w/PIC16F767 10b ADC, “broad-
cast on USART”. This mode is useful for evaluating the PICmicro microcontroller ’s
ADC. A IN_B can be injected with an alternative signal and the result can be
analyzed through the 19200 baud async, 9-bit transmission. Microchip’s Data
View analysis tool, along with the MCP3551 USB evaluation board, provide a
“canned” analysis solution.
6. Mode0101: DACB = 801h, DACA = 800h and Read w/MCP3302 13b Dif, “broad-
cast on USART”. This mode is useful for evaluating the MCP3302 or the
MCP3204 ADC. A IN_B can be injected with an alternative signal and the result
can be analyzed through the 19200 baud async, 9-bit transmission. Microchip’s
Data View analysis tool, along with the MCP3551 USB evaluation board, provide
a “canned” analysis solution.
7. Mode0110: DACB and DACA = 800h and Read w/MCP3551, “broadcast on
USART”. This mode is useful for evaluating the MCP3551 ADC or the MCP1541
V REF . A IN_B can be injected with an alternative signal and the result can be
analyzed through the 19200 baud async, 9-bit transmission. Microchip’s Data
View analysis tool, along with the MCP3551 USB evaluation board, provide a
“canned” analysis solution.
8. Mode0111: Open for user to define their own routine.
? 2004 Microchip Technology Inc.
DS51523A-page 13
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